Study on the Flatness in Surface Grinding

Necessary Force to Constrain the Thermal Deformation

Abstract

The heat generated in one-pass surface grinding causes the convex deformation of a workpiece. Therefore, the ground surface represents a concave profile. In this study, the thermal deformation of a workpiece attracted by magnetic chuck is investigated both theoretically and experimentally, and the necessary constraining force that completely constrains the convex deformation is computed. The main results obtained are as follows : (1) The ground surface attracted by magnetic chuck represents a concave profile. (2) The attraction force of magnetic chuck diminishes the, convex deformation. (3) When workpiece thickness to length ratio H/L does not exceed about 1/8, two concaves are formed by both ends of ground surface. (4) When a workpiece of HXL=20×80 (mm) is ground under a condition of 10μm down feed, the necessary constraining force is about 8 MPa.